Merge branch 'feature/no-variable-templates' into 'master'
Feature/no variable templates Due to the introduction of the variable template `staticDegree<N>` the master of `dune-typetree` does no longer compile with gcc-4.9 and hence you cannot use `dune-typetree` and thus `dune-functions` on debian stable. This merge request removed this variable template and uses `StaticDegree<N>::value` instead. As far as I can see the latter does not have any disadvantage despite being slightly more verbose. However, in this case the difference is rather small, such that using this new feature does hardy give any benefit but excludes many users. With this merge request the modules `dune-typetree` and `dune-functions` and their tests compile and run successfully with gcc-4.9. See merge request !13
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